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In CI, the error reporting level depends on the ENVIRONMENT setting in index.php.
There is a line with this code:

PHP Code:

define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'development'); 


This checks for the existence of the $_SERVER['CI_ENV'] superglobal.
If you're not sure about that, you can simply define the ENVIRONMENT constant like this:

PHP Code:

define('ENVIRONMENT','development'); 


Once you are ready to upload your website to a hosted server (in order to make it available online), you change it to:

PHP Code:

define('ENVIRONMENT','production'); 


On my computer, I have an index.php and an index_production.php
The first one is using the 'development' environment, the other one 'production'.
When I upload my website, I make sure that on the hosted server, my index_production.php is renamed to index.php.

A bit lower in index.php, you will see a "switch (ENVIRONMENT) {  }" structure.
With that, the correct error reporting level is set, depending on the value of the ENVIRONMENT constant.
The different levels are explained here: http://php.net/manual/en/function.error-reporting.php